Bleh when you see the bug as you hit "Send"....
(defn queue-process
[input output stats]
(async/go
; Wait for the first input.
(loop [v (async/<! input)
q clojure.lang.PersistentQueue/EMPTY]
(if v
(let [[val-to-q ch] (async/alts! [input [output v]])]
(swap! stats update-stats-as-you-see-fit q)
(cond
; Read a value from input.
val-to-q (recur v (conj q val-to-q))
; Input channel is closed. => Empty queue.
(identical? ch input) (recur nil (cons v q))
; Write happened, and there is more in the queue.
(pos? (count q)) (recur (peek q) (pop q))
; Write happened, and queue is empty. Start over.
:else (recur (async/<! input) q)))
(do
(doseq [v q] (async/>! output v))
(async/close! output))))))
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